Ezri

Ezri Dax is a 24th century joined Trill and the ninth host of the Dax symbiont. She is known for being counselor aboard Deep Space 9 under Sisko. The presence of Ezri Dax in Star Trek Timelines was first revealed in a dev blog, although few details have been released.

Note
Character Page named 'E. Dax' is linked here, because basically it is a version of the same character. Ezri Tigan is not 'Dax', because in mirror universe Ezri is not joined with Dax symbiont.